[Starlingx-discuss] Openstack: Correct configuration with 1 interface available for data network

[bnovickovs at weecodelab.com]

Hello,

I have 3 bare-metal servers therefore, I went for 2+2 aio-duplex setup. 
Simple non-manageable switch. (No vlans)

controller-0 - 3 NIC, 1 for mngmt/cluster, 1 for OAM, 1 for data 
network.
controller-1 - 3 NIC, 1 for mngmt/cluster, 1 for OAM, 1 for data 
network.
worker-0 - 2 NIC, 1 for mngmt/cluster, 1 for data network.

Thus, I am wondering what would be the right process of adding data 
network to openstack setup?

What I ve already tried:

1. Added flat data network on each node: system datanetwork-add physnet0 
flat
2. Created external network in openstack:

ENABLE_EXT_NET=${ENABLE_EXT_NET:-1}
EXT_NET_CIDR=${EXT_NET_CIDR:-'10.0.2.0/24'}
EXT_NET_RANGE=${EXT_NET_RANGE:-'start=10.0.2.150,end=10.0.2.199'}
EXT_NET_GATEWAY=${EXT_NET_GATEWAY:-'10.0.2.1'}
     openstack network create --external --provider-physical-network 
physnet0 \
         --provider-network-type flat public1
     openstack subnet create --no-dhcp \
         --allocation-pool ${EXT_NET_RANGE} --network public1 \
         --subnet-range ${EXT_NET_CIDR} --gateway ${EXT_NET_GATEWAY} 
public1-subnet
     openstack router set --external-gateway public1 demo-router

Using this setup, I cant have any virtual network in openstack using 
vxlan? If I have dhcp enabled for public1 network, I can create vm 
assigned with public1 network and ping/ssh machine directly. However, 
what I can do if I want to have private network and use public1 for my 
floating ip's? Do I need to have 1 more NIC card and assign 
data-network(vxlan) to that?

Thank you